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n in (-oo:+oo)
(-2*n-2)/3 = 12 // - 12
(-2*n-2)/3-12 = 0
(-2*n-2)/3+(-12*3)/3 = 0
-2*n-12*3-2 = 0
-2*n-38 = 0
(-2*n-38)/3 = 0
(-2*n-38)/3 = 0 // * 3
-2*n-38 = 0
-2*n-38 = 0 // + 38
-2*n = 38 // : -2
n = 38/(-2)
n = -19
n = -19
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